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Across 3. A table of the chemical elements arranged in order of atomic number (2 Words) 8. Determined by the number of protons in an atom (2 Words) 9. The center and most important of any object, atom, or element 11. Russian chemist who created the periodic table 12. The most simple of substances 13. A negatively charged subatomic particle 14. A unit of mass used to express atomic and molecular weights (3 Words) 15. The gain or loss of neutrons 16. The rows of elements on the Periodic Table 17. A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy (2 Words) 18. A positively charged subatomic particle 20. Refers to the particles which are emitted from nuclei as a result of nuclear instability.

Down 1. The number of electrons in an atom's outermost shell (2 Words) 2. A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivit 4. The column of elements on the Periodic table 5. A subatomic particle with no charge 6. An element or substance that is not a metal. 7. An element whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors. 8. The number of protrons and neutrons in an element (2 Words) 10. Where electrons are when the are traveling around the nucleus (2 Words) 19. The basic unit of a chemical element